CODEWITHSUNDEEP
java
sadia
sadia

Reputation: 2023

truncating number after decimal...through built in function in java

i want to truncate a number after decimal through a built in function in java (not javascript). for example: 69.80000000001 to 69.8

please guide.

Upvotes: 1

Views: 4967

Answers (2)

Arne Burmeister
Arne Burmeister

Reputation: 20604

You can use the scale functionality of BigDecimal:

new BigDecimal(69.80000000001).setScale(1, RoundingMode.HALF_UP).doubleValue();

This is for further using the rounded value. If you just want to print the rounded value but hold the original, DecimalFormat is the right choice as described by Matt.

Upvotes: 1

Matt Blaine
Matt Blaine

Reputation: 1976

What about the Decimal Format class?

I haven't tested this, but: Okay, this should work:

import java.text.DecimalFormat;
import java.math.RoundingMode;
public class Test
{
   public static void main(String args[])
   {
        double i = 69.8999999999;
        DecimalFormat format = new DecimalFormat("#.#"); 
        format.setRoundingMode(RoundingMode.FLOOR);
        String s = format.format(i);
        i = Double.parseDouble(s);
        System.out.println(i); //should be 69.8
   }
}

Upvotes: 2

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